Adapter for pressure gauges



April 7, 1931. R. RINNE ET Al.

ADAPTER FOR PRESSURE GAUGES Filed April 15, 1929 .w gs

immun jo el Richard Ring@ Marl??? L. H

Patented Apr. 7, 1931 nutren stares! PATENT FFC RICHARD RINNE, OFTACOIVIA, AND MARTIN L. APPEL E SMNER, WASHINGTON ADAPTER FOR PRESSURE{rAUGrIElSv Application filed April 15,

Our invention relates to adapters for use in applying pressure gauges todetermine the pressures existing` in engine cylinders.

The object ot our invention is to provide means for better and moreaccurately determining the maximum pressures existing in enginecylinders, more particularly the maximum pressure caused by compression.

A further object is to provide a simple and` readily applicable meanswhich will permit the use of a tire pressure gauge or other suitabletype of pressure gauge, for determining the pressure.

Uur invention consists in the use of a pressure retaining chamber,readily applicable to the cylinder, into which gases from the cylindermay be trapped and held until the pressure has been built up to themaximum produced in the cylinder, and to which a pressure gauge may beapplied.

It consists further in the provision of means whereby the impulsescaused by the rapid action ot' the compression may be sottened so as toavoid the blows upon the gauge which would be caused by` direct andimmediate application of these pressures thereto.

In the accompanying drawings we have shown a simple and efcientconstruction applicable to the carrying out of our invention.

In the following specilication we will describe the same and the mannerof its use, and in the claims will deiine Jthe novel features of ourlinvention.

Figure 1 is a longitudinal section through the adapter.

Figure 2 illustrates the manner of applying the same to an engine of awell known construction.

Figure 3 is a section taken on the line 3 8 of Fig. 1.

The present preferred form of construction for our device employs twoparts l and 2, which, together with the removable cap 3, `form apressure accumulating or retaining reservoir, tank, or casing which isconnected by one end with the interior of the engine cylinder, as by theaxially bored and exteriorly threaded neck 10, adapted to be screwedinto the spark plug opening for a cylinder.

Vithin or just inwardly of-neck 10 a ledge 1929. serial No. 355,392.

of" a` construction which will permit gases.

passing about its edges, or through notches, as 4:1-, in itsedge. Aspring 42 insures seating of the valve.

The two reservoir or container sections l and 2 are secured together, asby threading,- and between them is secured adiaphragm or partition 5having a smallA bleed hole, as 501, or otherwise constructed to providefor a highly throttled flow connection; between thechambers'at each sidethereof.

At the other end of the adapter the cap is provided with a pressurevretaining vallveA assembly which is adapted to the application ot agauge'thereto. This may be identical in construction and principle ofaction with. the valve assembly usedv onv pneumatic tires*l Such adevicelhas been shown, although any other typeA of construction by whichequivalent resultsmay be secured may be used. In view of the well knownand standard character of this construction a specific descriptionthereojis deemed to be unnecessary.

The operation of our deviceis as follows:

To determine the compression in a cylinn der, theI end 10 is screw-edinto a spark plug opening-and the-engineis turned over a'few times. 1 2to be charged withI gases atthe pressure offv maximum compressionproduced in the cylinder. The valve 40 Vfreely admits this pressure tothe chamber 13, but the diaphragm 5 preventsthe blow effect of a rapidlyproduced compression acting upon the chamber 20. The small area of theby-passage 50 causes a continuous and regular flow into chamber 20.Turning over of the engine should continue until the pressure has beenbuilt up to that of maximum compression. Then this condition has beenreached a gauge, operating in the same manner as a tire That shownconsists of a ring or- This causes theI reservoir or.` barrel ico CTI

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gauge, may be applied and will register the accumulated pressure, whichwill be that of the compression produced in the engine cylinder.

While it may be desirable to do so, the application of the gauge neednot Wait until the pressure has been built up to that of thecompression, as the partition 5 and the reduced by-pass hole thereinWill eliminate the hammer effect of the compression upon the gauge. Bythe use of the Wire-draWing caused by partition 5 the gauge may beapplied even before turning` over the engine. If the diaphragm be notused the application -oi' the gauge had better Wait until the pressurein chamber 2O has been entirely built up.

By the use of a device of this character an accurate determination ofthe compression pressure in a cylinder may be secured. This will be ofgreat help in diagnosing the condition o1L the valves and cylinderrings, and Will substitute certainty for uncertainty.

One reason for making the reservoir in the two parts, l and `2, is tofacilitate the application of the adapter to spark plug openings ofdierent sizes or threads. It is contemplated thatapluralityofbasesectionslbe provided, these having necks l0 of different sizes anddierent gauge of thread to lit dierent openings, andto use the baseWhich fits the particular plug opening. rlChe same result might besecured by simply adding a proper adapter to the neck 10, but We preferto do it in the other Way.

Vwlhat We claim as our invention is l. An adapter for use in measuringengine cylinder pressures comprising a gas storing reservoir adapted tobe connected With the engine cylinder, a valve at the pressure receivingend thereof preventing back lovv of gas, an axially bored stemprojecting from and in communication With said reservoir, and a tirevalve core received in said stem.

2. An adapter for use in measuring engine cylinder pressures having agas retaining reservoir adapted to be connected With the enginecylinder, means for preventing back flow of gases from said reservoir,an axially bored stem threaded in the Wall of the reservoir, and aremovable tire valve core received in the bore of said stein, whereby atire pressure gauge may be applied to the stem to read the pressureWithin the reservoir.

Signed at Seattle, Washington, this 9th day of April, 1929.

RICHARD RINNE. MARTIN L. APPEL.

